-78.35% is the change from 642 to 139
Calculation steps:
[( 139 - 642 ) ÷ 642] x 100 = -78.35%
Formula
Percentage change = [(139 - 642) / 642] x 100
Subtract the new number by the original number
139 - 642 = -503
-503 ÷ 642 = -0.7834890965732088
-0.7834890965732088 x 100 = -78.35%